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Efficacy of ultraviolet light (UV-C) and pulsed light (PL) for the microbiological decontamination of raw salmon (Salmo salar) and food contact surface materials
Pedrós-Garrido, S.; Condón-Abanto, S.; Clemente, I.; Beltrán, J.A.; Lyng, James G.; Bolton, Declan J.; Brunton, Nigel; Whyte, Paul
The decontamination effect of two light-based technologies on salmon, polyethylene (PE) and stainless steel (SS) was evaluated. Optimization of treatment conditions for ultraviolet light (UV-C) and pulsed light (PL) was carried out on raw salmon, obtaining inactivation levels of 0.9 and 1.3 log CFU/g respectively. The effects of treatments on several microbial groups present in salmon were then evaluated. For both technologies, Pseudomonas spp. were found to be the most resistant group of microorganisms tested. Three different strains from within this group were isolated and speciated, including a P. fluorescens strain which was selected for subsequent studies. PE and SS surfaces were inoculated with a suspension of the P. fluorescens suspended in a ‘salmon juice’ solution, and treated with UV-C and PL at different doses (mJ/cm2). PE surfaces were effectively decontaminated a low doses for both technologies, with a reduction of >4 log cycles observed. Decontamination of SS was also effective when treated with PL, although at higher doses than for PE. When SS was treated with UV-C, the maximum reduction of P. fluorescens achieved was 2 log cycles, even at the highest dose.
Keyword(s): Ultraviolet light; Pulsed light; Contact surfaces; Decontamination; Salmon; Pseudomonas
Publication Date:
2019
Type: Other
Peer-Reviewed: Yes
Language(s): English
Contributor(s): Department of Agriculture, Food and the Marine; 13F458
Institution: Teagasc
Publisher(s): Elsevier
First Indexed: 2019-08-20 07:05:11 Last Updated: 2019-09-28 07:05:15